Reason I'm asking is if he is getting the car and all for 1000 he might be ok if the rear is a rust bucket if he can recoop his losses on other parts from the car. The rust on the rear end alone makes me think that there is no way the u bolts are coming off in one piece and the rest of the housing might be as bad and MIGHT also be full of holes.
I know the folks on the east coast consider anything that can hold itself together to be a A+ part, but there are other areas out there where an A+ part is really an A+ part. (Not bashing east coast folks, it's all you have available)